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/*
This file is part of LilyPond, the GNU music typesetter.
Copyright (C) 2012 Mike Solomon <mike@mikesolomon.org>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
LilyPond is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "directional-element-interface.hh"
#include "grob.hh"
#include "fingering-column.hh"
#include "pointer-group-interface.hh"
#include "staff-symbol-referencer.hh"
#include "item.hh"
#include "paper-column.hh"
#define EPS 1e-5
struct Fingering_and_offset
{
Grob *fingering_;
Real offset_;
Fingering_and_offset (Grob *fingering, Real offset);
};
Fingering_and_offset::Fingering_and_offset (Grob *fingering, Real offset) :
fingering_ (fingering), offset_ (offset)
{
}
bool
fingering_and_offset_less (Fingering_and_offset fo0, Fingering_and_offset fo1)
{
return fo0.offset_ < fo1.offset_;
}
MAKE_SCHEME_CALLBACK (Fingering_column, calc_positioning_done, 1);
SCM
Fingering_column::calc_positioning_done (SCM smob)
{
Grob *me = unsmob<Grob> (smob);
if (!me->is_live ())
return SCM_BOOL_T;
me->set_property ("positioning-done", SCM_BOOL_T);
do_y_positioning (me);
do_x_positioning (me);
return SCM_BOOL_T;
}
void
Fingering_column::do_y_positioning (Grob *me)
{
extract_grob_set (me, "fingerings", const_fingerings);
if (const_fingerings.size () < 2)
{
me->programming_error ("This FingeringColumn should have never been created.");
return;
}
vector<Grob *> fingerings;
for (vsize i = 0; i < const_fingerings.size (); i++)
fingerings.push_back (const_fingerings[i]);
Grob *common[2] = {common_refpoint_of_array (fingerings, me, X_AXIS),
common_refpoint_of_array (fingerings, me, Y_AXIS)};
Real padding = robust_scm2double (me->get_property ("padding"), 0.2);
// order the fingerings from bottom to top
vector_sort (fingerings, pure_position_less);
vector<Real> shift(fingerings.size());
// Try stacking the fingerings top-to-bottom, and then bottom-to-top.
// Use the average of the resulting stacked locations as the final positions
for (UP_and_DOWN (d))
{
Real stack_end = -d * infinity_f;
Interval prev_x_ext;
for (vsize i = (d == UP)? 0 : fingerings.size() - 1;
i < fingerings.size ();
i += d)
{
Interval x_ext = fingerings[i]->extent(common[X_AXIS], X_AXIS);
Interval y_ext = fingerings[i]->extent(fingerings[i], Y_AXIS);
Real parent_y = fingerings[i]->get_parent(Y_AXIS)
->relative_coordinate(common[Y_AXIS], Y_AXIS);
// Checking only between sequential neighbors, seems good enough
if (!intersection(x_ext, prev_x_ext).is_empty())
stack_end += d * (y_ext.length() + padding);
// minmax() returns whichever is further along in direction d
stack_end = minmax(d, stack_end, parent_y);
shift[i] += 0.5 * (stack_end - y_ext[d] - parent_y);
prev_x_ext = x_ext;
}
}
for (vsize i = 0; i < fingerings.size (); i++)
fingerings[i]->translate_axis(shift[i], Y_AXIS);
}
void
Fingering_column::do_x_positioning (Grob *me)
{
extract_grob_set (me, "fingerings", fingerings);
if (!fingerings.size ())
return;
Grob *common_x = common_refpoint_of_array (fingerings, me, X_AXIS);
Real snap = robust_scm2double (me->get_property ("snap-radius"), 0.3);
vector<Fingering_and_offset> fos;
for (vsize i = 0; i < fingerings.size (); i++)
fos.push_back (Fingering_and_offset (fingerings[i], fingerings[i]->relative_coordinate (common_x, X_AXIS)));
vector_sort (fos, fingering_and_offset_less);
Direction dir = get_grob_direction (fingerings[0]);
if (dir == RIGHT)
reverse (fos);
Real prev = infinity_f * dir;
for (vsize i = 0; i < fos.size (); i++)
{
if ((fabs (fos[i].offset_ - prev) < snap)
&& (fabs (fos[i].offset_ - prev) > EPS))
fos[i].offset_ = prev;
prev = fos[i].offset_;
}
for (vsize i = 0; i < fos.size (); i++)
fos[i].fingering_->translate_axis (fos[i].offset_ - fos[i].fingering_->relative_coordinate (common_x, X_AXIS), X_AXIS);
}
void
Fingering_column::add_fingering (Grob *fc, Grob *f)
{
Pointer_group_interface::add_grob (fc, ly_symbol2scm ("fingerings"), f);
f->set_parent (fc, X_AXIS);
f->set_property ("Y-offset", Grob::x_parent_positioning_proc);
}
ADD_INTERFACE (Fingering_column,
"Makes sure that fingerings placed laterally"
" do not collide and that they are flush if"
" necessary.",
/* properties */
"padding "
"positioning-done "
"snap-radius "
);
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